After a few months of use, COM / NAV / XPDR switch is stuck ... what a shame, because this accessory is really nice. Fortunately Amazon return policy is effective, the instrument was traded ... The most worrying is that I also have an autopilot SAITEK, and after four months of use, the same problem occurred ... HS selector! I therefore conclude that the SAITEK notches selectors are really cause for concern ... SAITEK should be alerted to the problem -